Hi All,

It has come to my attention in the course of moving the DNS for a number of domains that several of the ISPs in this country are mangling the TTLs on records queried by their recursive DNS servers. This behaviour seems to me to be undesirable in situations where someone may have set a record to a shorter TTL to facilitate smoother movement between hosting providers. In the cases I’m seeing, records with TTLs of 14400 are being handed out with TTLs of 86400 by the service provider’s servers.

How common is this practice, and what are the benefits to the SP from doing it? From my perspective there is also the concern that this, for all intents and purposes appears to be bad practice, and serves to ‘break’ DNS in itself.

Regards,

Cameron Bradley